Pumping apparatus



March 21, 1933. J, F, JAWOROWS'KI 1,902,076

PUMP ING APPARATUS Filed May 14, 1929 5 Sheets-Sheet 1 INVENTOR ATTO R N EY March 21, 1933.

J. F. JAWOROWSKI 1,902,076

PUMPING APPARATUS I s Sheets-Sheet 2 Filed May '14, 1929 F'IE- 7 INVENTOR ATTORNEY Patented Mar. 21, 1933 UNITED STATES PATENT OFFICE JOSEPH F. JAWOROWSKI, 0F CLEVELAND, OHIO, ASSIGNOR OF ONE-THIRD TO SAMUEL E. DETTELBACH AND ONE-THIRD TO SAM W. EMERSON, BOTH OF CLEVELAND, OHIO PUMPING APPARATUS Application filed May 14, 1929. Serial No. 363,027.

The present-invention relates to pumping apparatus, and includes a rotary pump of simple construction and design which is particularly adapted to transfer or pump liquids, for example, gasoline or oil. In general, my object is to provide a very compact self-contained pumping unit, including a pump and pumping mechanism of novel construction adapted to be readily assembled and disassembled, and to function effectually when assembled, all substantially as herein shown and described and more particularly pointed out in the claims.

Thus, referring to the accompanying drawings, Fig. 1 is a front elevation, partly in section, of a meter cabinet containing a pumping unit embodying my improvements. Fig. 2 is an end elevation of the pump body, the end cover and other parts being detached to disclose the working parts within the body, and

,Fig. 3 is a sectional view centrally through the body with all the parts removed therefrom. Fig. 4 is a perspective View of the central division wall used within the pump body, and Fig. 5 is a perspective view of the locking member and extension for said division wall. Fig. 6 is a perspective view of one of the piston blades. Fig. 7 is a sectional view vertically through the pumping unit on line 77 of Fig. 10. Fig. 8 is a sectional View horizontally of the pump on line 88 of Fig. 7 and Fig. 9 is a sectional view on line 9-9 of Fig. 7. Fig. 10 is a sectional view vertically through the pumping unit on line 10--10 of Fig. 7.

The apparatus comprises a power pumping unit adapted to be installed within a cabinet or column in association with measuring dehorizontal shelves or arms 33 to permit an electric motor E and a pump P to be secured rigidly thereto in spaced relation. Thus, motor E is seated upon and bolted to the upper shelf 3 with the end-hub 5 of the motor and the motor shaft 6 projecting downwardly through an opening 4 in the shelf. Pump P, on the other hand, is bolted to the bottom of the lower shelf 3, which is formed with an opening 4 to receive the upwardly projecting parts of the pump, including its shaft 7. A universal coupling C of any suitable kind or description may be used to connect the shafts together.

Pump P includes a closure member 8 at its upper end having spreading arms 9 provided with bosses 10 to permit this member to be secured rigidly to the bottom shelf 3' by bolts 11. Radial ribs 8 on closure member 8 are machined with right angled shoulder 8" to fit snugly within the round opening 4: in shelf 3, thus centering pump P axially in respect to motor E.

The pump is thus suspended centrally in a horizontal position from frame A with the elongated hub 12 on member 8 projecting upwardly through the opening 4' in shelf 3'. A

rotatable screw cap 13 is attached to theexcap 13 when the cap is removed. Screw cap 13 may be rotated by hand to compress the packing and maintain a fluid tight joint.

around shaft 7 beyond its bushing or bearing 17 within hub 12. Coupling G and screw cap 13 may be conveniently reached for adjustments and replacements or repairs, inasmuch as frame A is open on three sides opposite these parts.

The main body 18 of pump P consists of an irregularly shaped casting having flanged ends formed with flat faces 20. A Keyshaped openingextends through the body from face to face, which opening includes a relatively large circularchamber 21', a smaller square or rectangularchamber 22, and a. narrow straight slot 23 on the medial line of the body connecting circular chamber 21 with the square chamber 22, see Fig. 3. A

circular intake port 24 extends through one end face of body 18 at one side of the medial 5 line, and thence downwardly at an angle on of body 18 has a similar tapering formation communicating with a second corner recess 27 at the base of slot 23 directly opposite the recess 25. These corner recesses 25 and 27, respectively, provide separate working chamber entrances and outlets which extend across the pump from face to face thereof on opposite sides-of slot 23. However, slot 23 and 'the circular working chamber 21 are divided into separate working spaces of equal dimensions by a central partition consisting of a flat round plate or disk 28 having a circular notch 29 within its upper edge, and a flat bar 30 having a round head 31 adapted to fit notch 29 and interlock with plate 28.. Bar 30 fits snugly within slot 23, and the round plate 28 fits chamber 21 snugly, these two pieces being placed mid-way between the ends of the slot and chamber when interlocked, see Figs. 7 and 8, thereby providing two separate workmg chambers within the pump body, each of which has open communication with the intake and discharge ports 24 and 26, respectively. A pair of flat reciprocable blades 3232 occupy slot 23 on the opposite sides of partition bar 30, see Figs. 7 and 10, and the lower ends of these blades are therefore interposed between the entrance recess 25 and the outlet recess 27, see Fig. 2. The lower portion of each reciprocable blade is also reduced in thickness, and rides or bears continuousl against a revoluble piston, a pair of such stons 3333' being employed side by side ut spaced apart by disk 28. Each piston is of smaller diameter than chamber 21 and mounted eccentrically upon driven shaft 7, see Figs. 2 and 7.

A large sector S of each piston involving about 90 of the circle is concentric with the axis of chamber 21 so that it snugly fits the circular wall of such working chamber within which it rotates. Preferably, the concentrlc engaging surface of each rotor is of such length as to fully cover both of the arcsha-ped intake and outlet ports 25 and 27 respectlvely, when this part of the rotor is passing said ports and the abutment member is raised to its maximum length. However, the intake and outlet ports 25 and 27 extend a short distance into the central wall of body 18 and also above the circle of movement of the concentric part of the rotor so that when the abutment blade is raised to its maximum length a small area thereof will still re main exposed to the fluid openings especially when the rotor is still in a position to cut'ofl all communication between the fluid open ings and its working chamber. The purpose of this working chamber arrangement is to keep one side of the abutment blade exposed to the fluid under pressure, so that the blade is pressed against one side wall of slot 23, whereby leakage is prevented between the inlet andoutlet openings. A further advan tageous result is obtained by the said arrangement whereby the fluid under pressure is transmitted to the upper end of the piston blade or abutment member and utilized to press the blade constantly against the rotor. Thus, the area of the top end of the blade is greater than the area exposed to the fluid at the lower end of the blade, and as the fluid under pressure acts to press the blade sidewise in its slot and seat, one side or seat is sealed and the other or pressure side affords a slight space through which the fluid under pressure may pass upwardly into the top opening 22 above the top edge of the blade. The fluid pressure on the upper end of the blade holds the blade in working engagement with the rotor under normal operating conditions, and it is also desirable that a supplemental pressure be present on each blade, to facilitate starting operations, to take up wear, to avoid loose play, and to effect a balancing and equalizing movement between the pair of blades. The two eccentric rotors 3333' or pistons are keyed to the shaft 180 apart or in balance, thereby counterbalancing each other, and they co-act with the reciprocable abutment blades to produce a continuous flow of liquid when the motor is running.

The reciprocable blades 3232' are engaged at their upper ends by a rocking beam or member 34 which is pivotally connected at its middle to a slotted or bifurcated holder 35 slidably confined within a round opening formed within a boss or protruding part 36 of the pump body, see Figs. 8 and 9. Holder 35 has a shallow recess adapted to seat one end of a coiled compression spring 37, and the opposite end of thisspring is confined within a hollow nut 38 having a screw connection with boss 36. Nut 38 compresses the spring and causes rocking beam 34 to bear yieldingly at its rounded ends against the reciprocable blades. The upper ends of these blades are channeled or grooved to hold the rocking beam in working alignment with the blades and to prevent the holder from rotating within its seat when the nut is rotated to either increase or decrease the tension. In operation a pressure is built up in chamber 22 which is equal to the pressure onthe discharge side of the pump, and the outer end edges of the reciprocable blades are exposed to this pressure and the blades are thereby held constantly in contact with the rotors independently of the spring-pressed rocking beam. The reduction in width of the inner ends of the blades where engaged with the rotor, is

also a factor in keeping the blades in contact constantly with the rotor.

The rectangular chamber 22 in which the rocking beam is confined is filled with the same liquid being pumped, and priming may be eflected at opening 39 in cover 8 when screw plug 40 is removed, see Fig. 7. y In operation, the liquid is distributed to the working parts within the pump, but pressure is prevented from'building'up in the stufiing box thereby preventing leakage at gland member 16 and shaft 7 by employing a duct 41 for the lubricant in cover 8, see Fig. 10. Thus, duct 41 communicates with the intake port 24 or suction side of the pump and it extends from the packing chamber 42 in hub 12 downwardly through the hub and cover 8 to a point off-center of the pump where it registers or communicates with an opening 4.3

in the face of the pump oppositeintake port 24, see Fig. 10.

The pump includes a bottom closure Plate or head 44 which is bolted to body 18 and provided with a hushed bearing 45 for the lower end of pump shaft 7. A screw plug 46 is screwed to head 44 to'close and seal the opening for shaft 7. 'The liquid to be pumped passes through head 44 which has an opening 47 opposite intake port 24 in body 18, and also a chamber 48 containing a removable strainer or filter 49, the sides of which are exposed to the liquid entering the head through an elbow or passage 50 which is screw-threaded at its mouth for connection with a supply pipe, see'Fig. 10.

The strainer or filter 49 is a wire screen or a fine mesh body of cylindrical form adapted to be seated and locked in place within chamber 48 by a screw member 51 and a coiled spring 52. A pressure relief valve 53 is also seated in a movable position within a cross bore 54 in head 44v at one side of A opening 47. Preferably, a removable cage 55 is provided for valve 53, and the inner end of cross bore 54 formed with a rightangled passage 56 adapted to register with an opening 57 at the botom of discharge port 26, see Fig. 10. Accordingly, should an excessive pressure build up in the discharge line for the pump, valve 53 will open automatically and by-pass the liquid from the discharge side to the intake side of the pump.

Under these conditions, the pump operates idly without injury to the electric motor or pump. Sealing or closing of the by-pass valve 53 is also retarded under such conditions, that is, the closing of the. valve suddenly is prevented, by a plunger 53' attached to the valve and operating within a dash pot 55 forming part of cage 55, see Fig. 10. Hammering and chatter is also prevented.

and bears against the split or partly severed portion 62 to permit the nut to be locked within its threaded seat by merely turning the screw 61. The entrance 63 of the screwthreaded opening for nut 59 is a continuation of cross bore 54, and this entrance is closed and sealed by a separate nut 64 having a beveled face 65 adapted to be seated tightly against the corner edge of the entrance.

What I claim is:

1. In a rotary pump unit as described, a pump body having a round piston chamber, and a smaller chamber connected by. a slot, and a removable partition wall within said round piston chamber, and a removable partition bar within said narrow slot pivotally coupled with said partition wall and co-operating therewith in subdividing said chambers and .slot into independent compartments.

2. In a rotary pump unit as described, a pump body having a round piston chamber and a smaller chamber connected by a slot, and a removable partition for said round piston chamber and slot comprising a flat round plate having a circular notch within one edge and a flat bar fitting. into said slot hav-' ing a round head confined within said notch.

In testimony whereof I aflix my signature.

JOSEPH F. JAWOROWSKI.

A coiled compression spring 58 bears against valve 53 to hold it to its seat under normal conditions, or until a predetermined working pressure is reached, and a nut 59 

